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Articles 1 - 16 of 16
Full-Text Articles in Engineering
Restoring Floodplains In The Connecticut River Basin: A Flood Management Strategy, Abigail Ericson
Restoring Floodplains In The Connecticut River Basin: A Flood Management Strategy, Abigail Ericson
Environmental & Water Resources Engineering Masters Projects
This research investigates how changes to floodplains in the Connecticut River Basin impact flood events. Climate impacted flows and increased development within the floodplain could lead to worsening flood events and less habitat availability for threatened species. Potential future conditions are evaluated through a wide range of scenarios to assess the range of possible impacts using a HEC-RAS 2D model. Three different flood events, 1-yr, 10-yr, and 100-yr, are evaluated for each scenario. Five metrics, Discharge, Depth, Time of Arrival, Flooding Duration, and Number of Buildings Flooded, are tracked for each scenario. These metrics are compared to select the ideal …
Robust Drought Planning In Megacities: A Case Study In São Paulo, Brazil, Grace Cambareri
Robust Drought Planning In Megacities: A Case Study In São Paulo, Brazil, Grace Cambareri
Environmental & Water Resources Engineering Masters Projects
The megacity of São Paulo, Brazil recently faced a severe three-year drought (2013- 2015) that highlighted the challenges of growing water demands, unpredictability of future supply, and proper communication with the public during crisis. Given the poor outcomes of the recent drought, the question remains as to how the drought can be used to inform and improve future drought preparedness. This study develops a seven-step framework using simulation and a computational search to identify promising drought plans based on the historic record. These promising plans are then tested under alternative states of the world to explore their robustness and identify …
Pilot Reactor Operation Of The Oxygenic Photogranule (Opg) Wastewater Treatment Process, Adam Matthew Mcnair
Pilot Reactor Operation Of The Oxygenic Photogranule (Opg) Wastewater Treatment Process, Adam Matthew Mcnair
Environmental & Water Resources Engineering Masters Projects
Treating wastewater is imperative for maintaining public health and sanitation as well as the natural environment. In the United States and developed countries around the globe, the activated sludge (AS) process has been paramount in effectively treating wastewater for over a century. However, high energy consumption due to required mechanical aeration of AS limits its potential as a sustainable process. The oxygenic photogranule (OPG) wastewater treatment process utilizes the photosynthetic ability of OPGs made possible by the symbiosis between heterotrophic AS and filamentous cyanobacteria and algae in dense, spherical biogranules. This research presents pilot operation of the OPG wastewater treatment …
Effects Of Sulfidation On The Deposition And Detachment Of Silver Nanoparticles, Joseph Murphy
Effects Of Sulfidation On The Deposition And Detachment Of Silver Nanoparticles, Joseph Murphy
Environmental & Water Resources Engineering Masters Projects
The transformation of silver nanoparticles (AgNPs) due to environmental factors can play a role in their fate and transport in aquatic systems. Sulfidation has the potential to alter these particles’ physio-chemical properties and their subsequent mobilization in aquatic environments. The water chemistry (e.g. pH, dissolved organic carbon) of these systems can also change the behavior of AgNPs. To better understand the effects of sulfidation on the characteristics and deposition of AgNPs, techniques such as quartz crystal microgravimetry (QCM) and dynamic light scattering (DLS) were used. In this study, AgNPs with two different ligand types, Polyvinylpyrrolidone (PVP)-capped AgNPs (PVP-AgNPs) and Polyethylene …
Evaluation Of Disinfection Byproduct Speciation Models Based On Biodegradation And Chemical Decomposition, Xian Ma
Environmental & Water Resources Engineering Masters Projects
The USEPA has regulated both chlorinated and brominated trihalomethanes (THMs) and haloacetic acids (HAAs) since Stage 2 D/DBP Rule. Among regulated species, all four chlorinated and brominated THMs are regulated as total TTHMs (TTHM). But of the nine HAAs, only the sum of five (HAA5) are regulated, with no detail on individual species. This leaves four unregulated HAAs of which all contain bromine. With more attention on the brominated haloacetic acids due to their higher toxicity, the focus on the formation of those unregulated brominated species is elevated. The objective of this study is to assess national occurrence of all …
Investigation Of Safety At Toll Plazas Through Microsimulation And Driving Simulation Approaches, Foroogh Sadat Hajiseyedjavadi
Investigation Of Safety At Toll Plazas Through Microsimulation And Driving Simulation Approaches, Foroogh Sadat Hajiseyedjavadi
Transportation Engineering Masters Projects
Toll plazas are one of the critical components of a roadway system for capital financing, infrastructure maintenance revenue, or traffic maintenance and congestion control strategies. At the same time, they are among the most complex road structures, as drivers are exposed to a large amount of information and have a short amount of time to make a decision. Since the advent of electronic toll collection (ETC) technology, the complexity of toll plazas has greatly increased. The objective of this study is to investigate the effect of toll plaza design and traffic conditions on drivers’ behavior and level of safety. This …
River And Stream Power Assessment Report Including Culvert And Bridge Vulnerability Analysis: Deerfield River Basin, Massachusetts And Vermont, James G. Macbroom, Roy Schiff, Jessica Louisos
River And Stream Power Assessment Report Including Culvert And Bridge Vulnerability Analysis: Deerfield River Basin, Massachusetts And Vermont, James G. Macbroom, Roy Schiff, Jessica Louisos
Water Reports
This geomorphic assessment of Deerfield River in western Massachusetts and southern Vermont has been prepared by Milone & MacBroom, Inc. (MMI) on behalf of the University of Massachusetts as part of its "Farms, Floods, and FGM" project, funded by the United States Department of Agriculture – National Institute of Food and Agriculture National Integrated Water Quality Program(USDA – NIFA NIWQP) program. This project is a broad-based geomorphic assessment of the Deerfield River and its adjacent riparian corridor to define its characteristics, processes, and management issues. The river channel is used extensively for hydroelectric power generation and recreation, with agricultural …
Environmental Implications Of Nanotechnology, Boris Lau, Joann Mariie Rodríguez
Environmental Implications Of Nanotechnology, Boris Lau, Joann Mariie Rodríguez
Science and Engineering Saturday Seminars
No abstract provided.
Wood Studio Workshop, Peggi Clouston, Rommel L Cordova‐Fiori
Wood Studio Workshop, Peggi Clouston, Rommel L Cordova‐Fiori
Science and Engineering Saturday Seminars
No abstract provided.
Superhero Robotics, Frank Sup, Brian Umberger, Nick Sawyer
Superhero Robotics, Frank Sup, Brian Umberger, Nick Sawyer
Science and Engineering Saturday Seminars
No abstract provided.
Rheological Characterization Of Liquid-To-Solid Transitions In Bulk Polyelectrolyte Complexes, Yalin Liu, Brian Momani, H. Henning Winter, Sarah L. Perry
Rheological Characterization Of Liquid-To-Solid Transitions In Bulk Polyelectrolyte Complexes, Yalin Liu, Brian Momani, H. Henning Winter, Sarah L. Perry
Chemical Engineering Faculty Publication Series
Polyelectrolyte complexation has long been known to result in both liquid and solid complexes. However, the exact nature of the liquid-to-solid transition remains an open question. We have used rheology to explain this phenomenon for the model system of poly(4-styrenesulfonic acid, sodium salt) (PSS) and poly(diallyldimethyl ammonium chloride) (PDADMAC) in the presence of potassium bromide (KBr). The use of a time-salt superposition allows for a detailed analysis of changes in the linear viscoelastic response for both liquid complex coacervates and solid polyelectrolyte complexes as a function of salt concentration, and facilitates unambiguous determination of the mechanism for this phase transition. …
The Effect Of Comb Architecture On Complex Coacervation, Brandon M. Johnston, Cameron W. Johnston, Rachel A. Letteri, Tyler K. Lytle, Charles E. Sing, Todd Emrick, Sarah L. Perry
The Effect Of Comb Architecture On Complex Coacervation, Brandon M. Johnston, Cameron W. Johnston, Rachel A. Letteri, Tyler K. Lytle, Charles E. Sing, Todd Emrick, Sarah L. Perry
Chemical Engineering Faculty Publication Series
Complex coacervation is a widely utilized technique for effecting phase separation, though predictive understanding of molecular-level details remains underdeveloped. Here, we couple coarse-grained Monte Carlo simulations with experimental efforts using a polypeptide-based model system to investigate how a comb-like architecture affects complex coacervation and coacervate stability. Specifically, the phase separation behavior of linear polycation-linear polyanion pairs was compared to that of comb polycation-linear polyanion and comb polycation-comb polyanion pairs. The comb architecture was found to mitigate cooperative interactions between oppositely charged polymers, as no discernible phase separation was observed for comb-comb pairs and complex coacervation of linear-linear pairs yielded stable …
A Student-Created, Open Access, Living Textbook, Sualyneth Galarza, Sarah L. Perry, Shelly Peyton
A Student-Created, Open Access, Living Textbook, Sualyneth Galarza, Sarah L. Perry, Shelly Peyton
Chemical Engineering Faculty Publication Series
Textbooks are expensive, updated infrequently, and rarely used effectively by students. We discuss here a way for students to create the textbook for the course, helping them feel ownership over the course material. This Wiki-based, student-created textbook is online free for use, widely accessible by all, and editable during the course of and as topics evolve. This type of textbook format is particularly well suited to upper-level electives on topics that are rapidly emerging. We have nucleated a student created textbook here, fully online and open access, for two upper elective courses in chemical engineering. Wikis offer an easy-to-learn platform …
Microfluidics: From Crystallization To Serial Time-Resolved Crystallography, Shuo Sui, Sarah L. Perry
Microfluidics: From Crystallization To Serial Time-Resolved Crystallography, Shuo Sui, Sarah L. Perry
Chemical Engineering Faculty Publication Series
Capturing protein structural dynamics in real-time has tremendous potential in elucidating biological functions and providing information for structure-based drug design. While time-resolved structure determination has long been considered inaccessible for a vast majority of protein targets, serial methods for crystallography have remarkable potential in facilitating such analyses. Here, we review the impact of microfluidic technologies on protein crystal growth and X-ray diffraction analysis. In particular, we focus on applications of microfluidics for use in serial crystallography experiments for the time-resolved determination of protein structural dynamics.
Sequence And Entropy-Based Control Of Complex Coacervates, Li-Wei Chang, Tyler K. Lytle, Mithun Radhakrishna, Joel J. Madinya, Jon Vélez, Charles E. Sing, Sarah L. Perry
Sequence And Entropy-Based Control Of Complex Coacervates, Li-Wei Chang, Tyler K. Lytle, Mithun Radhakrishna, Joel J. Madinya, Jon Vélez, Charles E. Sing, Sarah L. Perry
Chemical Engineering Faculty Publication Series
Biomacromolecules rely on the precise placement of monomers to encode information for structure, function, and physiology. Efforts to emulate this complexity via the synthetic control of chemical sequence in polymers are finding success; however, there is little understanding of how to translate monomer sequence to physical material properties. Here we establish design rules for implementing this sequence-control in materials known as complex coacervates. These materials are formed by the associative phase separation of oppositely charged polyelectrolytes into polyelectrolyte dense (coacervate) and polyelectrolyte dilute (supernatant) phases. We demonstrate that patterns of charges can profoundly affect the charge–charge associations that drive this …
Strain-Stiffening Gels Based On Latent Crosslinking, Yen H. Tran, Matthew J. Rasmuson, Todd Emrick, John Klier, Shelly Peyton
Strain-Stiffening Gels Based On Latent Crosslinking, Yen H. Tran, Matthew J. Rasmuson, Todd Emrick, John Klier, Shelly Peyton
Chemical Engineering Faculty Publication Series
Gels are an increasingly important class of soft materials with applications ranging from regenerative medicine to commodity materials. A major drawback of gels is their relative mechanical weakness, which worsens further under strain. We report a new class of responsive gels with latent crosslinking moieties that exhibit strain-stiffening behavior. This property results from the lability of disulfides, initially isolated in a protected state, then activated to crosslink on-demand. The active thiol groups are induced to form inter-chain crosslinks when subjected to mechanical compression, resulting in a gel that strengthens under strain. Molecular shielding design elements regulate the strain-sensitivity and spontaneous …